1 8t misfire P0302, p0303, p0300

[@mirneskova]

Thanks a lot i just discovered that my fist coil is making misfire my car runs so bad and i disconected cable for coil on cylinder 1 and same thing tried on other 3 and they are ok now you help me to save much money i just know that is coil or spark plug on cylinder 1

[@CoolAirVw]

i'm glad our channel helped!

[@wizbang16]

Excellent work. I wish I lived closer and could bring my car to you!

[@CoolAirVw]

thanks.

[@fredflintstone8048]

Great job. Of course hindsight is always 20-20. After successfully diagnosing a problem it's always easy to look back at the process and see how the problem could have been found faster, but if the misfire was caused by something else which it could have been, then the approach you actually took may have been faster.

[@CoolAirVw]

Thanks for the kind words.

[@hassanissa9741]

Grat explanations wating for part 2

[@genarorios5211]

I’m having issues with my 1.8, I checked my spark plugs like you did and my ignition coil isn’t making it spark. I switched coils and it did spark. Would the issue just be that one coil?

[@CoolAirVw]

sounds logical. Here is some info on coil diagnosis kzbin.info/www/bejne/nl7LdKJvlNd6i80

[@lagerback1747]

hello! i have this same problem. my engine sound exactly like yours did. i unplugged the coilpack on CYL.2 and nothing happened. i can start it up and idles fine. but when i rev it over 2500RPM it starts to missfire and no firing on CYL.2, do i have the same problem as you or can it be something else?`im loosing my mind.. BIG regards casper.

[@CoolAirVw]

There is no way you can know if you have the same problem unless you do the testing that was done in the video or some type of comparable test.

[@lagerback1747]

i've tried everything.. coilpacks, igniton module, checked all the cables, sparkplugs, compression,injectors, injector seats, even change the wiring.. im looooooosing my mind!!

[@CoolAirVw]

@@lagerback1747 Do you have vagcom or a scanner that can show you misfires? Are your misfires on a specific cylinder?

[@lagerback1747]

@@CoolAirVw unfortunately not, i have misfire on cyl 2

[@danielbowersmusic]

2004 Jetta 1.8t here. Cylinder 3 misfire Code keeps popping up no matter what I do however the car seems to be running fine. Changed spark plug, swapped both the ignition coil and fuel injector with cylinder #2 however the code kept popping up for cylinder #3. Any idea what could keep throwing this code even if it's firing? Could it be a grounding issue for the ignition coil like I've heard or could it be the computer like in this case?

[@yurivojka2850]

did zou fix it?

[@danielbowersmusic]

@@yurivojka2850 it was a bad exhaust valve. Still haven't fixed it as my cars running fine for now but I plan to tear it down this summer when time permits.

[@brianbotticelli7356]

Have you seen random misfires for a few seconds that ONLY occur after a heat soak (15-30min)? Otherwise, the engine runs great. New spark plugs, new coils and swapped fuel injectors w/o resolve? 2003 Passat 1.8T AWM, auto 2wd. P0300 P0302 P0303 P0304

[@CoolAirVw]

what are fuel trims?

[@marko_._]

Is it safe to drive the car with one cylinder misfire for some days at low speeds? The engine is shaking quite often while accelerating and even when driving slowly. Sometimes it's fine too. I got the cylinder 4 misfire and the coil pack is faulty, gonna change it when i get the parts!

[@CoolAirVw]

Damage to cat or cylinder wash, is possible but not likely due to cylinder deactivation.

[@JustCommenting4]

Where can I get a compression tester and oscilloscope kit like used in the video?

[@CoolAirVw]

I think I used a snap on compression tested in this video. Available used on ebay or new from snap on. I use a pico scope available from AESwave.com

[@EXOVCDS]

I'm also curious about the immobilizer / delete. =)

[@CoolAirVw]

We can do immo delete here or program the immo. I was not able to make a video on programming the immo as I was out of time.

[@CoolAirVw]

I appreciate you watching my channel.

[@EXOVCDS]

@@CoolAirVw VagTacho? We don't do programming / pin retrieval etc... but the boss should really start looking into it. A how-to / summary video of what's involved would be great!

[@osiris122cf]

What you can't make another video about the immobilizer del?

[@joebeebe79]

Came across this video searching for hope on my Jetta I just bought. Did a valve cover gasket (changed nothing else, ran beautiful prior) now has the same thing happening. Autozone scanner said cylinder 3 and 4 misfire. Moved coils, switched harness plugs (ran worse) new Bosch iridium plugs (old ones seemed very black, was probably due anyways) then pulled plug for cylinder 4 while idling- no change to idle. (Also pulled plug on cylinder 3 and there is a drastic change) Pretty sure the same is happening. But find it a weird coincidence that it happened right after Changing vcg. I’ve pulled back the tape job on the wire harness checking for cracked wires (wires look Original) have found no issues down to the main split coming from beside the valve cover where it disappears into the abyss beside the engine. Doing compression test today to rule out that as well, but sounds like I’m in the same boat. Any input you may have would be great. I don’t have access to a scope like you have, is the control signal findable by an ohmmeter or anything else?

[@CoolAirVw]

the best test for control signal is with a scope, but you can try test light or noid light.

[@joebeebe79]

ok I will try those, thank you! Not many shops in my area will even look at these cars, so they don’t have proper diagnostics for them. I appreciate your quick reply, and love your videos!

[@CoolAirVw]

@@joebeebe79 thank you. Let me know how it turns out. You can also pull out the coil, put the spark plug in the coil, plug in the coil and crank the engine to watch the spark plug to see if it sparks. Make comparison of known good cylinder.

[@joebeebe79]

@@CoolAirVw yep, did that last night. No spark on misfiring cylinder. Plugged same coil and spark plug into another cylinder harness and had good spark. So definitely somewhere between that harness plug and the ecu

[@CoolAirVw]

@@joebeebe79 Ohm check the wire between.

[@kris1935]

Just out of curiosity what kind of headliner was on that car

[@CoolAirVw]

I dont know.

[@kris1935]

@@CoolAirVw all good

[@V.Racing650R]

Hey nice vid, and now why you have misfire I have the same. And what you found now?

[@CoolAirVw]

the video shows why. computer damaged and not able to control one of the coils. If I recall correctly. This isn't a common failure. You may want to watch other misfire videos, for instance the one that has thumnail that shows, "SHHHH!".

[@maxidave1]

Did you do eeprom to the pcm?

[@CoolAirVw]

No. Video coming soon, hopefully.

[@maxidave1]

I’ll look forward to it.

[@davidmorgan2146]

I have a stage 2 modded Audi '04 A4 B6 1.8T. Last night I was out for a spin after doing a bit of work on the airbox, and trying to adjust the aftermarket turbo inlet pipe for clearance. At first the car ran fine, but boost was down a little. TIP may have been squeezed a bit by the headlight. After a couple pulls on the highway I hit the off ramp. A few mins later, it started running a little rough, and then got worse fast. I barely made it home. Now the car runs *extremely rough, and it's difficult to even keep it running. At first I thought I blew a head gasket or something, but there is no water in the oil, and I'm getting misfire codes on every cylinder. So I'm wondering where to start looking. The car went from running fine to barely chugging home in a *progressively worse fashion in a matter of minutes. Any ideas on where I should start my diagnostic search? P0300 code plus a code for every cylinder. ~thanks

[@CoolAirVw]

There are bunches of things to rule out. One thing though, head gasket can be leaking water into cylinder without contaminating the oil, it can also do so without steaming.,. if its a minor leak. Timing belt off one tooth, Timing chain from cam to cam off, vacuum leak, fuel delivery problem ect.

[@EXOVCDS]

7:43 my favorite number... 318! =)

[@CoolAirVw]

why is that?

[@EXOVCDS]

@@CoolAirVw It's a number that has been haunting me for the last 10 years. I see it / spot it everywhere... movies, license plates, phone numbers, youtube videos etc. Prior to your video (that I watched today) this is what I posted on my instagram yesterday: instagram.com/p/BwdNgA0DdJ4/

[@helpontheway]

I just dont understand why you took this approach. First thing I would have done is check the wiring diagram for that year/model and find color codes for that connector. You would have been able to certainly point out that the harness was indeed not the original one. Your reasoning for switching the connectors is not valid because again, you are making assumptions. Not good practice brother. Wonder how you 'fix' other misfire issues.

[@CoolAirVw]

Unfortunately, I cant rewatch the video to understand which "approach" you are concerned with.

[@CoolAirVw]

Cast the first stone after you make and publish 180 video's on youtube (after you walk a mile in my shoes) I'm certain none of my diagnostic processes are perfect, and certainly neither are yours. Some of my videos , make comment on how my approach could have been better. But, I fix every car that comes through my shop. I'm that guy. Are you? If so more power to you.

[@helpontheway]

@@CoolAirVw fine. I tip my hat to ya. 180 vids while getting down at the shop day in/out is no joke. Keep it up

[@CHIBA280CRV]

Man you guys really need to learn how to use the scope , take advantage of its capabilities. ! You could had zoomed in and gotten a clear view of the coil signal and or the command..great to have a pico scope..thanks for the video , glad to see you got lucky and made a decision on the bad computer , or was it ?

[@CoolAirVw]

Diagnosis was perfect on this. I'm not going to re watch the video but we saw right off the bat there was no control signal. Your upset that I didn't "zoom in" to your liking?

[@CHIBA280CRV]

No , no , no ,,,,,, , L.O.L....😂🤣..I’m not upset , it would have been nice to see a clear picture of the command signal on the screen ...But I appreciate the video never the less..hope your upset cause of the criticism ? This is KZbin life , you need a thick skin...✌🏻

[@CoolAirVw]

@@CHIBA280CRV 13:53 I show known good command signal on the screen. 15:52 I show "NOT GOOD" command control. no scope setting changes between 13:53 and 15:52. Not sure what your wanting, but this diag was perfect. maybe sometimes I dont present that well, but I think I did fantastic job on this one. Thanks for watching.

[@CHIBA280CRV]

You guys did a fantastic diagnosis, I appreciate the video fellows..

[@passomalaga4782]

Ök danke

[@CoolAirVw]

keine Ursache

[@helpontheway]

cant tell if youre being sarcastic on some things bro.

[@CoolAirVw]

Cant tell if your a jerk or trying to make constructive criticism. Are you a Vw mechanic or just a troll?

[@juniorcruz960]

Where can I get another ecu box with the same box numbers 🤔 instead of down tuning my original box.?.

[@CoolAirVw]

salvage yard. But you'll have immo issues.

[@passomalaga4782]

Hallo ich habe ein broblm est golf 5 1.4 benzin code PO191 bitter awh PO302

[@CoolAirVw]

Ich habe keine Erfahrung mit 1,4-Motoren, da sie hier nicht verkauft wurden.